Abstract: A projectile flier has a flying body, a propeller device mounted on the flying body and an actuator detachably combined to the flying body to rotate the propeller device. The flying body has a tube located at its gravity center to rotatably combine with an axis of the propeller device. The actuator has a handle with a pulling device that efficiently drives the axis of the propeller device to rotate. Until the propeller device rotates at high speed to provide efficient floating force, the flying body disengages from the actuator and flies into sky. By efficiently rotating the propeller device with the pulling device, rotation speed of the propeller device is significantly increased to make the flying body fly over a long period and a far distance.

Abstract: A frisbee includes an annular main disk, and an annular support member mounted on the main disk. Thus, the support member can be detached from the main disk, so that the frisbee is foldable when not in use, thereby facilitating storage, package and transportation of the frisbee. In addition, the frisbee is guided by the cord to fly along a circumferential orbit, so that the frisbee can be played by a single player. Further, the frisbee can be played by two players and can also be played by a single player, thereby enhancing the versatility of the frisbee.

Abstract: A string pulling device for a racket stringer includes a base, a rotation unit, a drive unit, a string pulling unit, and a top cover. Thus, the rack of the drive unit meshes with the gear of the rotation unit, so that the rotation disk is rotated rapidly to reach the destined tension unit, thereby facilitating a user adjusting the values of the pulling stress so as to control the pond and tension required for stretching the strings of a tennis or badminton racket. In addition, the string pulling device provides a precise positioning structure.

Abstract: A pinwheel assembly has a main shaft, a plurality of curved rods, a first rotating wheel, a second rotating wheel, a third rotating wheel, a fourth rotating wheel, and a plurality of fabric vanes. The main shaft passes through the first rotating wheel, the second rotating wheel, the third rotating wheel, and the fourth rotating wheel. Each of the curved rods is connected to the first rotating wheel and the fourth rotating wheel. Each of the fabric vanes is connected to the second rotating wheel and the third rotating wheel.

Abstract: A pinwheel assembly has a polygonal main body, and a rotating device disposed in a center of the polygonal main body. The rotating device has a bearing and a hollow shaft. A plurality of support rods are connected to the bearing. The hollow shaft is inserted through the bearing. The polygonal main body has a plurality of diagonal lines. A plurality of through holes are formed on the diagonal lines of the polygonal main body. A plurality of triangular vanes are disposed on the polygonal main body. Each triangular vane has a triangular end bag. Each support rod is inserted in the corresponding triangular end bag and inserted through the corresponding through hole of the polygonal main body.

Abstract: A pinwheel device has a main shaft, a rotating wheel connected to the main shaft, and a first support rod, a second support rod, and a third support rod connected to the rotating wheel. A first decoration wheel is disposed on the rotating wheel. A second decoration wheel is disposed on the first support rod. A third decoration wheel is disposed on the second support rod.

Abstract: A pinwheel has a plurality of curved blades, a lower rotating wheel, a decoration article, an upper rotating wheel, a shaft rod passing through the lower rotating wheel, the decoration article and the upper rotating wheel, and an illuminating lamp inserted in the shaft rod. The lower rotating wheel has a plurality of circular apertures. The upper rotating wheel has a plurality of round apertures. Two ends of each curved blade are inserted in the respective circular aperture and the respective round aperture.

Abstract: A kite structure includes a body, and a skeleton. The body has an upper piece and a lower piece stitched on the upper piece in a locally overlapping manner. Each of the upper piece and the lower piece has a central portion provided with a positioning base and a plurality of retaining rings. Each of the upper piece and the lower piece has a front edge provided with curved tubular collars.

Abstract: A kite has a cover sheet and a cross-shaped frame. The cover sheet has an oblong hole and four triangular corner bags. The cross-shaped frame has a spine, a two-way joint disposed on the spine, and two crosspieces connected to the two-way joint. Two rotating wheels are disposed on the spine. A plurality of rotating vanes engage with the rotating wheels. The spine is inserted in two of the triangular corner bags. Each of the crosspieces is inserted in the corresponding triangular corner bag. Two tail bands are connected to the cover sheet.